Molecular packing and solid-state fluorescence of alkoxy-cyano substituted diphenylbutadienes: Structure of the luminescent aggregates

被引:163
作者
Davis, Riju [1 ]
Kumar, N. S. Saleesh [1 ]
Abraham, Shibu [1 ]
Suresh, C. H. [2 ]
Rath, Nigam P. [3 ,4 ]
Tamaoki, Nobuyuki [5 ]
Das, Suresh [1 ]
机构
[1] CSIR, Reg Res Lab, Natl Inst Interdisciplinary Sci & Technol, Chem Sci & Technol Div,Photosci & Photon Sect, Trivandrum 695019, Kerala, India
[2] CSIR, Natl Inst Interdisciplinary Sci & Technol, Computat Modeling & Simulat Sect, Trivandrum 695019, Kerala, India
[3] Univ Missouri, Dept Chem & Biochem, St Louis, MO 63121 USA
[4] Univ Missouri, Ctr Nanosci, St Louis, MO 63121 USA
[5] Natl Inst Adv Ind Sci & Technol, Nanotechnol Res Inst, Mol Smart Syst Grp, Tsukuba, Ibaraki 3058565, Japan
关键词
D O I
10.1021/jp710352m
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
A detailed study on the photophysical properties of a series of alkoxy substituted diphenylbutadienes in solution and in the solid state providing a molecular level understanding of the factors controlling their solid-state luminescence behavior is reported. Our studies provide clear evidence for exciton splitting in the solid state resulting in red-shifted emission for this class of materials. The role of the number of alkoxy substituents and the alkyl chain length in controlling the nature of the molecular packing and consequently their fluorescence properties has been elucidated. Whereas in the di- and tri-alkoxy substituted derivatives, the solid-state fluorescence was independent of the length of the alkyl chains, in the monoalkoxy substituted derivatives, increasing the length of the alkyl chain resulted in a visual change in fluorescence from green to blue. On the basis of the analysis of the molecular packing in the single crystals, this difference could be attributed to fluorescence arising from aggregates with an edge-to-face alignment in the molecules possessing short alkyl chains (methyl and butyl) to monomer fluorescence in the long alkyl chain containing derivatives.
引用
收藏
页码:2137 / 2146
页数:10
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